[PATCH v3 06/16] efd: handle possible name truncation

[Stephen Hemminger <stephen@networkplumber.org>]

If the conversion of efd name to ring name gets truncated, then
log it. And if the ring name than causes collision, make sure
that log message includes error reason.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/efd/rte_efd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/efd/rte_efd.c b/lib/efd/rte_efd.c
index ebf1e0655f..ed2c509938 100644
--- a/lib/efd/rte_efd.c
+++ b/lib/efd/rte_efd.c
@@ -698,12 +698,15 @@ rte_efd_create(const char *name, uint32_t max_num_rules, uint32_t key_len,
 	TAILQ_INSERT_TAIL(efd_list, te, next);
 	rte_mcfg_tailq_write_unlock();
 
-	snprintf(ring_name, sizeof(ring_name), "HT_%s", table->name);
+	if (snprintf(ring_name, sizeof(ring_name), "HT_%s", table->name)
+	    >= (int)sizeof(ring_name))
+		EFD_LOG(NOTICE, "EFD ring name truncated to '%s'", ring_name);
+
 	/* Create ring (Dummy slot index is not enqueued) */
 	r = rte_ring_create(ring_name, rte_align32pow2(table->max_num_rules),
 			offline_cpu_socket, 0);
 	if (r == NULL) {
-		EFD_LOG(ERR, "memory allocation failed");
+		EFD_LOG(ERR, "ring creation failed: %s", rte_strerror(rte_errno));
 		rte_efd_free(table);
 		return NULL;
 	}
-- 
2.51.0